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 A263310 Numbers n such that p=6*n+1, q=6*p+1 and r=6*q+1 are primes. 1
 10, 25, 55, 61, 101, 125, 156, 220, 221, 381, 391, 465, 475, 495, 576, 810, 891, 901, 975, 1060, 1145, 1396, 1430, 1630, 1650, 1726, 1795, 1811, 1881, 1885, 1915, 2196, 2265, 2335, 2391, 2405, 2456, 2536, 2575, 2636, 2651, 2820, 2911, 2915, 2951, 2965, 3051, 3211, 3245, 3335 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Subsequence of A263309 (and as such also of A024899). LINKS MAPLE isA263310 := proc(n) return isprime(6*n+1) and isprime(36*n+7) and isprime(216*n+43) ; end proc: for n from 1 to 3000 do if isA263310(n) then printf("%d, ", n); end if; end do: # R. J. Mathar, Oct 17 2015 MATHEMATICA Select[Range[10000], PrimeQ[p=6*#+1]&& PrimeQ[q=6*p+1]&& PrimeQ[r=6*q+1]&] PROG (PARI) for(n=1, 1e4, if(isprime(p=6*n+1)&&isprime(q=6*p+1)&&isprime(6*q+1), print1(n", "))) \\ Altug Alkan, Oct 17 2015 CROSSREFS Cf. A024899, A263309. Sequence in context: A022670 A072277 A283243 * A063424 A137930 A251310 Adjacent sequences: A263307 A263308 A263309 * A263311 A263312 A263313 KEYWORD nonn AUTHOR Zak Seidov, Oct 13 2015 STATUS approved

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Last modified March 31 21:40 EDT 2023. Contains 361673 sequences. (Running on oeis4.)